Piston



Jan. 8, 1924. 1,480,481,

I R. W. WAKEFIELD PISTON Filed Sept. 25. 1921 H W Wa/fefz'ala Patented den. 8, 1924.

PATENT OFFICE- ROBERT W WAKEFIELD, OF LANGELOTH, PENNSYLVAITIA.

Application filed September 23,1921. Serial No.v 502,788.

'To all whom it ma concern;

Be it known at I, Rosana W. WAKE- FIELD, a citizen of the United States, re-

siding at Langeloth, in the county of Wash-' ington and State of Pennsylvania, have invented certain new and useful Improve-' ments in a Piston; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art 'to which it ap ertains to made and use the same.

'l his invention relates to a piston of the type usedin firing cylinders of internal combustion engines.

An important object'is to provide such a piston with a chamber in which the explosions may directl occur in order that the inner side wall 0 the cylinders and piston rings will not have to withstand the maximum expansion of fuel incidental to explosions, and whereby the number of piston rings employed may be greatly reduced and entirely eliminated, andwhereby the motor may satisfactorily operate with faulty piston rings.

Additional objects and advantages will become a parent from a consideration of the speci cation hereinafter following with reference to accompanying drawings illustrating one practical'embodiment.

In said drawings Figure 1 is a vertical sectional view through a piston construction in accordance with my invention, and shown in connec-.

tion with a fra ent' of an internal combus- 131011 engine cylmder, and

al Figure 2 is a front elevation of the piston one Figure 3 is a plan view' of the piston alone. Referring particularly to the drawings,

the improved piston is shown at 4 slidable in the usual manner within a cylinder 5 forming part of a conventional type of internal combustion engine. From the piston a usualconnecting rod 6 extends being connected thereto by means of a wrist pin 7.

It will be noted that the piston has a chamber 8 extending inwardly from its up-' rend surrounded by an annular wall 9. his chamber 8 serves as a firingchamber so'that explosion is confined in said chamber. Due to the construction mentioned, the wall 9 prevents the maximum expansionof ignited occurring intermediate the mner wall of cylinder 5 and the outer wall of the piston, in order to relieve the usual piston ring of the action thereof.

Below the firing chamber 8 is a relatively thick transverse wall 10 which is periphemploymentof but one since a number may be used if desired. The employment of the smglepiston ring with satisfactory results is attamed by relieving the piston rings of the maximum expansion of i ited gases. I have also found that piston rings in some instances are not at all necessary and that the piston will work satisfactory with piston rings when worn or faulty.

. It is clear of course that the operation is the same in an engine equipped with my piston, as in ordinary engines with the exception that the explosion occurs within the firing chamber 8 and against the upper wall of the cylinder 5. Of course in connect-ion with the cylinder 5, the usual inlet and exfiring means are employed.

In order that lubricant may effectively reach the exterior wall of the piston and inner. wall of the cylinder 5, suitable grooves 13 may be provided exteriorly on the.

haust means as well as spark plugsor other Having thus described the invention, what' I intersecting each other at a. point to deliver In testimony whereof I aflix my signature the collected oil to the wrist pin hearings in presence of two witnesses. of the piston at the upper side of the bearings, and said piston having oil grooves in- ROBERT W. WAKEFIELD. 5 tersecting at the lower side of the wrist pin Witnesses:

bearings and diverging downwardly there- L. H. Wmnmzs,

from. W. E. SHELTON. 

